Skip to content
Public Universe
Comet

LINEAR

Add to an observing list or journal →

C/2004 U1 (LINEAR)

LINEAR is a comet in the Comet orbit class. Its orbit takes it from 2.66 AU to 6,682.91 AU from the Sun; one orbit takes 193,272.7 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
41.42 AU
True anomaly
150.73°
Distance from Earth
41.497 AU
As of
25 October 2026

Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.

Sun Earth — 0.994 AU from the Sun Earth LINEAR — 41.42 AU from the Sun LINEAR
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. LINEAR is 41.497 AU from Earth today (5.8 light-hours).

In the sky

Right ascension
19h 51m 17s
Declination
-13° 56′ 42″
Constellation
Sagittarius
Distance from Earth
41.51 AU
Elongation from the Sun
84.36° — well clear of the Sun

Visible from both hemispheres.

From your location

See how high it is right now, whether it is up after civil twilight, and when it rises and sets where you are.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.

Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.

Orbital elements

Semi-major axis
3,342.784 AU
Eccentricity
0.9992
Inclination
130.62°
Orbital period
193,272.7 years
Perihelion
2.659 AU
Aphelion
6,682.908 AU
Longitude of ascending node
112.55°
Argument of periapsis
20.13°
Epoch · J2000
2453375.5
Orbit class · COM
Comet
Earth MOID · 665.0 LD
1.7089 AU
Tisserand (Jupiter)
-1.315

Orbit quality

Observations used
545
Data arc
345 days
First observed
16 October 2004
Last observed
26 September 2005
Residual RMS
0.64 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
9
Total magnitude M₁ · K₁ 7.5
9

Discovery & classification

Also known as 2004 U1

Named

Sources